Charge doping of graphene in metal/graphene/dielectric sandwich structures evaluated by C-1s core level photoemission spectroscopy | Zendy

Arjun Dahal | Zendy; Rafik Addou | Zendy; Horacio Coy-Diaz | Zendy; James Lallo | Zendy; Matthias Batzill | Zendy

Open Access

Charge doping of graphene in metal/graphene/dielectric sandwich structures evaluated by C-1s core level photoemission spectroscopy

Author(s) -

Arjun Dahal,

Rafik Addou,

Horacio Coy-Diaz,

James Lallo,

Matthias Batzill

Publication year - 2013

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4824038

Subject(s) - graphene , materials science , doping , dielectric , fermi level , photoemission spectroscopy , metal , condensed matter physics , spectroscopy , x ray photoelectron spectroscopy , nanotechnology , optoelectronics , nuclear magnetic resonance , physics , electron , metallurgy , quantum mechanics

We show that for metal/graphene/dielectric sandwich structures, charge doping in graphene depends on both the work functions of the metal and the dielectric. Using C-1s core level photoemission spectroscopy we determine the charge doping in graphene for one-sided metal contacts as well as for sandwich structures that are commonly used in graphene devices. The measured Fermi-level shifts are in good agreement with a model that predicts that the difference in charge doping for graphene on a metal compared to graphene sandwiched between a metal and dielectric is given by ΔEF ≈ 0.44 × √(Φmetal − Φdielectric)

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